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+# Standards used in Delta Chat
+
+Some of the standards Delta Chat is based on:
+
+Tasks                            | Standards
+---------------------------------|---------------------------------------------
+Transport                        | IMAP v4 ([RFC 3501](https://tools.ietf.org/html/rfc3501)), SMTP ([RFC 5321](https://tools.ietf.org/html/rfc5321)) and Internet Message Format (IMF, [RFC 5322](https://tools.ietf.org/html/rfc5322))
+Embedded media                   | MIME Document Series ([RFC 2045](https://tools.ietf.org/html/rfc2045), [RFC 2046](https://tools.ietf.org/html/rfc2046)), Content-Disposition Header ([RFC 2183](https://tools.ietf.org/html/rfc2183)), Multipart/Related ([RFC 2387](https://tools.ietf.org/html/rfc2387))
+Identify server folders          | IMAP LIST Extension ([RFC 6154](https://tools.ietf.org/html/rfc6154))
+Push                             | IMAP IDLE ([RFC 2177](https://tools.ietf.org/html/rfc2177))
+Authorization                    | OAuth2 ([RFC 6749](https://tools.ietf.org/html/rfc6749))
+End-to-end encryption            | [Autocrypt Level 1](https://autocrypt.org/level1.html), OpenPGP ([RFC 4880](https://tools.ietf.org/html/rfc4880)) and Security Multiparts for MIME ([RFC 1847](https://tools.ietf.org/html/rfc1847))
+Configuration assistance         | [Autoconfigure](https://developer.mozilla.org/en-US/docs/Mozilla/Thunderbird/Autoconfiguration) and [Autodiscover](https://technet.microsoft.com/library/bb124251(v=exchg.150).aspx)
+Messenger functions              | [Chat-over-Email](https://github.com/deltachat/deltachat-core-rust/blob/master/spec.md#chat-over-email-specification)
+Detect mailing list              | List-Id ([RFC 2919](https://tools.ietf.org/html/rfc2919)) and Precedence ([RFC 3834](https://tools.ietf.org/html/rfc3834))
+Send and receive system messages | Multipart/Report Media Type ([RFC 6522](https://tools.ietf.org/html/rfc6522))
+Return receipts                  | Message Disposition Notification (MDN, [RFC 8098](https://tools.ietf.org/html/rfc8098), [RFC 3503](https://tools.ietf.org/html/rfc3503)) using the Chat-Disposition-Notification-To header
+Locations                        | KML ([Open Geospatial Consortium](http://www.opengeospatial.org/standards/kml/), [Google Dev](https://developers.google.com/kml/))
+